Supplements · Metabolic & Cardiometabolic
garlic slows atherosclerosis progression
In plain terms: Does aged garlic extract slow heart disease?
Leans support Supplements 🔬 Includes disconfirming
Part of: 🧪 Garlic
RefutedContestedStrong support
consensus score 0.55
Too early to say. A few trials suggest aged garlic extract slows the buildup of coronary calcium — but nearly all come from one lab, on surrogate scan measures rather than actual heart attacks or deaths, and no trial has tested hard outcomes. Promising, not proven.
📅 Last reviewed: 2026-07-15 ⓘ
Evidence ladder
How far up the ladder this claim has climbed. A high consensus on a low rung means "consistent so far," not "proven in people."
Top evidence so far: All trials, pooled (Meta-analysis)
MechanismIn-vitroAnimalObservationalRCTMeta-analysis
How the studies fall
8 support 0 contradict 1 tested null 5 mixed · 14 sources, 7 independent groups · 5 superseded — pooled inside a review, counted once
What the evidence shows
Aged garlic extract appears to slow surrogate markers of atherosclerosis (coronary-calcium and plaque progression, arterial stiffness). Most trials come from a single lab (Budoff/Harbor-UCLA) reanalyzing overlapping cohorts, but there is now independent replication - notably an independent Swedish CAC RCT (Wlosinska 2020) and a Polish arterial-stiffness RCT.
The evidence (22)
| Source | Grade | Stance | Quality | Finding |
|---|---|---|---|---|
| Varshney R, Budoff MJ 2016 · J Nutr | observational | mixed | low | Narrative review (Budoff co-author): AGE favorable on CAC/CRP/PWV; calls for larger trials. |
| Wlosinska M, Nilsson AC, Hlebowicz J, Hauggaard A, Kjellin M, Fakhro M, Lindstedt S 2020 · BMC Complement Med Ther | RCT | supports | moderate | INDEPENDENT RCT (Lund, Sweden): AGE 2400mg/d x1y slowed coronary-calcium progression, lowered IL-6/glucose/SBP. Surrogate imaging - first non-Budoff CAC trial. ↩ SUPERSEDED — pooled in the review above, counted once |
| Ahmadi N, Tsimikas S, Hajsadeghi F, Saeed A, Nabavi V, Bevinal MA, Kadakia J, Flores F, Ebrahimi R, Budoff MJ 2010 · Am J Cardiol | RCT | mixed | low | Oxidative-stress biomarkers correlated with lower CAC progression (Budoff lab, mechanism). |
| Chao CJ, Lakshmanan S, Ceponiene I, Luo Y, Nakanishi R, Nezarat N, Kanisawa M, Budoff MJ 2021 · Coron Artery Dis | RCT | mixed | low | Garlic-4 substudy (Budoff lab): new carotid plaque predicted coronary progression (surrogate). |
| Emamat H, Tangestani H, Totmaj AS, Ghalandari H, Nasrollahzadeh J 2020 · Clin Nutr | observational | mixed | moderate | INDEPENDENT systematic review 10 RCTs: garlic's effect on vascular reactivity/stiffness INCONSISTENT across trials. |
| Shaikh K, Kinninger A, Cherukuri L, Birudaraju D, Nakanishi R, Almeida S, Jayawardena E, Shekar C, Flores F, Hamal S, Sheikh MS, Johanis A, Cu B, Budoff MJ 2019 · Exp Ther Med | RCT | supports | low | AGE reduced low-attenuation coronary plaque in diabetics via CCTA (Budoff lab, surrogate). ↩ SUPERSEDED — pooled in the review above, counted once |
| Zeb I, Ahmadi N, Nasir K, Kadakia J, Larijani VN, Flores F, Li D, Budoff MJ 2012 · J Cardiovasc Dis Res | RCT | supports | low | AGE+CoQ10 lowered CAC progression 3.99-fold + CRP in firefighters (Budoff lab, surrogate). |
| Ahmadi N, Nabavi V, Hajsadeghi F, Zeb I, Flores F, Ebrahimi R, Budoff M 2013 · Int J Cardiol | RCT | mixed | low | AGE+S adipose shifts + no CAC progression (Budoff lab). |
| Matsumoto S, Nakanishi R, Li D, Alani A, Rezaeian P, Prabhu S, Abraham J, Fahmy MA, Dailing C, Flores F, Hamal S, Broersen A, Kitslaar PH, Budoff MJ 2016 · J Nutr | RCT | supports | moderate | RCT (n=55, metabolic syndrome): 2400 mg/d aged garlic extract reduced low-attenuation coronary plaque on CCTA over 1 yr. Surrogate endpoint; SAME lab as Budoff (not independent). ↩ SUPERSEDED — pooled in the review above, counted once |
| Larijani VN, Ahmadi N, Zeb I, Khan F, Flores F, Budoff M 2012 · Nutrition | RCT | supports | moderate | FAITH trial: AGE+CoQ10 improved pulse-wave velocity + endothelial function (Budoff lab, surrogate). |
| Myasoedova VA, Kirichenko TV, Melnichenko AA, Orekhova VA, Ravani A, Poggio P, Sobenin IA, Bobryshev YV, Orekhov AN 2016 · International journal of molecular sciences | RCT | mixed | moderate | Double-blind placebo-controlled RCT, n=157 postmenopausal women, 12 months, isoflavonoid-rich herbal preparation ('Karinat': garlic powder + grape-seed tannins + green-tea leaf + hop-cone powder, 500mg/d) vs placebo, carotid IMT endpoint. c |
| Murali S, Smith ER, Tiong MK, Tan SJ, Toussaint ND 2023 · Journal of the American Heart Association | meta-analysis | supports | high | Systematic review of 49 RCTs (n=9901 total) testing interventions against cardiovascular-calcification progression by radiological endpoint. Trials involving aged garlic extract (n=6 studies) 'consistently showed attenuation of cardiovascul |
| Orekhov AN, Sobenin IA, Korneev NV, Kirichenko TV, Myasoedova VA, Melnichenko AA, Balcells M, Edelman ER, Bobryshev YV 2013 · Recent patents on cardiovascular drug discovery | RCT | supports | moderate | AMAR (Atherosclerosis Monitoring and Atherogenicity Reduction) study: 2-yr RCT, time-released garlic drug Allicor vs placebo, n=196 asymptomatic men aged 40-74, carotid IMT by B-mode ultrasound. Allicor group IMT change -0.022±0.007 mm/yr v |
| Stabler SN, Tejani AM, Huynh F, Fowkes C 2012 · Cochrane Database Syst Rev | meta-analysis | tested-null | high | Cochrane review: NO RCTs met criteria for garlic's effect on hard cardiovascular morbidity/mortality - an evidence gap, not a positive finding. |
| Yang S, Cao Z, Liu H, Li Z, Nie S, Xie M 2024 · Frontiers in nutrition | observational | supports | moderate | Two-sample Mendelian Randomization using GWAS/IEU data found garlic intake causally associated with reduced atherosclerosis risk (OR=0.985, p=0.036) and lower LDL-C/triglycerides, the strongest atheroprotective association among 28 fruits/v |
| Szulinska M et al. 2018 · Biomed Pharmacother | RCT | supports | moderate | INDEPENDENT RCT (Poland): garlic 400mg/d x3mo reduced arterial stiffness, hsCRP, PAI-1, LDL in obese. Surrogate. |
| Zeb I, Ahmadi N, Flores F, Budoff MJ 2018 · Coron Artery Dis | RCT | mixed | low | AGE+supplements reduced peri-cardiac adipose progression (Budoff lab, surrogate). |
| Tang YY, Lv D 2025 · Scientific reports | in-vitro | supports | low | Alliin (garlic organosulfide) protected ox-LDL-injured HUVECs, upregulating LDLR/ApoC and downregulating ApoB in cholesterol metabolism pathway; proteomic/Western blot validation, no animal or human data. |
| Budoff MJ, Ahmadi N, Gul KM, Liu ST, Flores FR, Tiano J, Takasu J, Miller E, Tsimikas S 2009 · Prev Med | RCT | supports | moderate | RCT (n=65): aged garlic extract + B-vitamins/folate/L-arginine slowed 1-yr coronary-calcium progression vs placebo. Surrogate imaging; single lab (Harbor-UCLA), Kyolic-funded. ↩ SUPERSEDED — pooled in the review above, counted once |
| Schwingshackl L, Missbach B, Hoffmann G 2015 · Phytomedicine | observational | supports | moderate | INDEPENDENT umbrella review: garlic lowers TC and BP consistently, but no atherosclerosis-imaging endpoint (risk-factor surrogate only). |
| Budoff MJ, Takasu J, Flores FR, Niihara Y, Lu B, Lau BH, Rosen RT, Amagase H 2004 · Prev Med | RCT | supports | low | Founding pilot n=19: AGE slowed EBT coronary-calcium progression in statin patients (Budoff lab). ↩ SUPERSEDED — pooled in the review above, counted once |
| Gao T, Gao S, Wang H, Wang S, Li L, Hu J, Yan S, Zhang R, Zhou Y, Dong H 2024 · Frontiers in pharmacology | animal | supports | moderate | ApoE-knockout mouse model plus network pharmacology; garlic active components (Allicin, alliin, etc.) reduced ferroptosis-related gene expression and intra-plaque lipid peroxidation, with in vitro validation of core targets (DPP4, ALOX5, GP |
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